As a devoted soldier of The Empire, Tomoe is perfectly willing to Save The World by curbstomping it into submission wherever necessary, fully convinced that it's okay because she and her friends are pillars of truth and light.
Downplayed: Tomoe is somewhat a good person at heart, although in a pragmatic manner. Because of this, she knows that everything she does is right, no matter how harsh her actions can be.
Tomoe was raised to believe this.
Good is a cosmic force that is not connected to any sort of moral obligations. Furthermore, certain races and jobs (such as "soldiers for justice") are considered to be aligned to Good, and thus get to exploit this cosmic force for their own reasons. Anything these Good people do must, by definition, be Good.
Inverted: Naoya is convinced that he is evil and everything he does is evil by default, despite how he's been singlehandedly defending his hometown from The Empire, keeping everyone he knows safe, and rescuing kittens from trees in his spare time.
Subverted: Despite her devotion to the cause, Tomoe balks when charged to torch the village of Bloomton. After all, even if some of them might be harboring members of La Résistance, what about all the innocents living there...?
Double Subverted: However, she's easily convinced that everyone in Bloomton is in on the rebellion's charade, and as a guardian of justice, it's her duty to punish them—!
Invoked: From a young age, Tomoe is told by her mentor that she is inherently pure and just, and will become an unstoppable force for good in the future. He deliberately teaches her this in order to raise an unquestionably loyal soldier convinced of her moral superiority.
Discussed: "Why do people praise her as a hero? She's a murderer!"
Deconstructed: Tomoe's beliefs are the lynchpin to her sanity. Her entire identity and sense of self-worth is built around the idea that everything she does is ultimately 'good'; she simply can't second-guess herself, for fear that those insecurities and doubts will prove overwhelming. Even when confronted with seemingly undeniable proof that her actions have had terrible, evil consequences, she retreats further into denial and mental instability. Eventually, this leads to General Kaizo to put her down when she started becoming a threat to the empire's plans.
Reconstructed: Tomoe is confronted with her evil deeds and at first has a Freak Out! but ultimately dismisses those heretics who would try to undermine her beliefs and cause such doubts. They are the evil ones! They don't understand true justice!
Tomoe used to be good friends with Ichigo, but her Wide-Eyed Idealism was easily manipulated by General Kaizo, who has her convinced that she and the rest of the empire's forces are paragons of virtue and that her former friend has been blinded by the darkness.